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Simply deleting files won’t erase an external drive permanently

On an external drive, the delete key is more of a suggestion than a final verdict. Files that appear to vanish from a USB stick, portable SSD, or backup hard drive often linger in the background, ...
Ars Technica

Using terminal to erase external SSD hard drive

The disk in question is disk04 - a 128 GB SSD drive in an external USB enclosure. I booted the Macbook from a X.11 USB install drive and there was an internal SSD drive as well. a simple fdisk ...
Tidbits

How to Securely Erase a Mac’s SSD or Hard Drive

Over on TidBITS Talk, user Lucas043 posed a question that prompted a fascinating discussion. Lucas043 has a Samsung Portable T7 SSD being used for backup. The SSD has intermittent access problems and ...
CNET

Cannot delete locked files on external volumes

Users with external hard drives or other storage devices may run into problems accessing files on these devices, especially when attempting to delete files that are reported by Mac OS X to be "locked" ...
Ars Technica

WD My Passport external drive: how to delete Drive Lock?

So I picked up a 750GB WD My Passport at BB a couple days ago, oblivious to the added Drive Lock/Smart BU crap on the label - I was going to format it anyway. After formatting for Mac OS Extended, I ...